/**************************************************************************
-* Unix-like crypt(3) Algorithm for Password Encryption
+* Implementation of crypt(3) using routines in libcrypto from openssl for
+* use on Android in Termux.
*
-* File : crypt3.c
-* Purpose : Provides crypt(3) functionality to ANSI C compilers
-* without a need for the crypt library.
-* Author : Michael Dipperstein
-* Date : November 3, 1998
+* https://www.freebsd.org/cgi/man.cgi?crypt(3)
+* http://man7.org/linux/man-pages/man3/crypt.3.html
*
-***************************************************************************
-* The source in this file is heavily borrowed from the crypt3.c file
-* found on several ftp sites on the Internet. The original source
-* claimed to be BSD, but was not distributed with any BSD license or
-* copyright claims. I am releasing the source that I have provided into
-* public domain without any restrictions, warranties, or copyright
-* claims of my own.
-*
-* The code below has been cleaned and compiles correctly under, gcc,
-* lcc, and Borland's bcc C compilers. A bug involving the left and
-* right halves of the encrypted data block in the widely published
-* crypt3.c source has been fixed by this version. All implicit register
-* declarations have been removed, because they generated suboptimal code.
-* All constant data has been explicitly declared as const and all
-* declarations have been given a minimal scope, because I'm paranoid.
-*
-* Caution: crypt() returns a pointer to static data. I left it this way
-* to maintain backward compatibility. The downside is that
-* successive calls will cause previous results to be lost.
-* This can easily be changed with only minor modifications to
-* the function crypt().
+* Relevant code is from FreeBSD with license given below.
**************************************************************************/
-/* Initial permutation */
-static const char IP[] =
+/*
+ * Copyright (c) 2011 The FreeBSD Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <openssl/sha.h>
+#include <openssl/md5.h>
+
+/* START: Freebsd compat */
+typedef unsigned long u_long;
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#define MD5_SIZE 16
+#define _PASSWORD_EFMT1 '_'
+#define DES_SALT_ALPHABET \
+ "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+#define MD5Init MD5_Init
+#define MD5Update MD5_Update
+#define MD5Final MD5_Final
+/* END: Freebsd compat */
+
+
+/* START: https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/misc.c */
+static char itoa64[] = /* 0 ... 63 => ascii - 64 */
+ "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+void
+_crypt_to64(char *s, u_long v, int n)
{
- 58, 50, 42, 34, 26, 18, 10, 2,
- 60, 52, 44, 36, 28, 20, 12, 4,
- 62, 54, 46, 38, 30, 22, 14, 6,
- 64, 56, 48, 40, 32, 24, 16, 8,
- 57, 49, 41, 33, 25, 17, 9, 1,
- 59, 51, 43, 35, 27, 19, 11, 3,
- 61, 53, 45, 37, 29, 21, 13, 5,
- 63, 55, 47, 39, 31, 23, 15, 7,
+ while (--n >= 0) {
+ *s++ = itoa64[v&0x3f];
+ v >>= 6;
+ }
+}
+
+void
+b64_from_24bit(uint8_t B2, uint8_t B1, uint8_t B0, int n, int *buflen, char **cp)
+{
+ uint32_t w;
+ int i;
+
+ w = (B2 << 16) | (B1 << 8) | B0;
+ for (i = 0; i < n; i++) {
+ **cp = itoa64[w&0x3f];
+ (*cp)++;
+ if ((*buflen)-- < 0)
+ break;
+ w >>= 6;
+ }
+}
+/* END: https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/misc.c */
+
+
+/* START: https://github.com/freebsd/freebsd/blob/master/secure/lib/libcrypt/crypt-des.c */
+#if defined(__GNUC__) && !defined(lint)
+#define INLINE inline
+#else
+#define INLINE
+#endif
+
+static u_char IP[64] = {
+ 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
+ 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
+ 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
+ 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7
};
-/* Final permutation, FP = IP^(-1) */
-static const char FP[] = {
- 40, 8, 48, 16, 56, 24, 64, 32,
- 39, 7, 47, 15, 55, 23, 63, 31,
- 38, 6, 46, 14, 54, 22, 62, 30,
- 37, 5, 45, 13, 53, 21, 61, 29,
- 36, 4, 44, 12, 52, 20, 60, 28,
- 35, 3, 43, 11, 51, 19, 59, 27,
- 34, 2, 42, 10, 50, 18, 58, 26,
- 33, 1, 41, 9, 49, 17, 57, 25,
+static u_char inv_key_perm[64];
+static u_char key_perm[56] = {
+ 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
+ 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
+ 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
+ 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
};
-/**************************************************************************
-* Permuted-choice 1 from the key bits to yield C and D.
-* Note that bits 8,16... are left out:
-* They are intended for a parity check.
-**************************************************************************/
-static const char PC1_C[] =
-{
- 57, 49, 41, 33, 25, 17, 9,
- 1, 58, 50, 42, 34, 26, 18,
- 10, 2, 59, 51, 43, 35, 27,
- 19, 11, 3, 60, 52, 44, 36,
+static u_char key_shifts[16] = {
+ 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
};
-static const char PC1_D[] =
-{
- 63, 55, 47, 39, 31, 23, 15,
- 7, 62, 54, 46, 38, 30, 22,
- 14, 6, 61, 53, 45, 37, 29,
- 21, 13, 5, 28, 20, 12, 4,
+static u_char inv_comp_perm[56];
+static u_char comp_perm[48] = {
+ 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
+ 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
+ 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
+ 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
};
-/* Sequence of shifts used for the key schedule. */
-static const char shifts[] =
- {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
+/*
+ * No E box is used, as it's replaced by some ANDs, shifts, and ORs.
+ */
-/**************************************************************************
-* Permuted-choice 2, to pick out the bits from the CD array that generate
-* the key schedule.
-**************************************************************************/
-static const char PC2_C[] =
-{
- 14, 17, 11, 24, 1, 5,
- 3, 28, 15, 6, 21, 10,
- 23, 19, 12, 4, 26, 8,
- 16, 7, 27, 20, 13, 2,
+static u_char u_sbox[8][64];
+static u_char sbox[8][64] = {
+ {
+ 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
+ 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
+ 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
+ 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
+ },
+ {
+ 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
+ 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
+ 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
+ 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
+ },
+ {
+ 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
+ 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
+ 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
+ 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
+ },
+ {
+ 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
+ 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
+ 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
+ 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
+ },
+ {
+ 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
+ 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
+ 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
+ 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
+ },
+ {
+ 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
+ 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
+ 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
+ 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
+ },
+ {
+ 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
+ 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
+ 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
+ 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
+ },
+ {
+ 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
+ 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
+ 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
+ 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
+ }
};
-static const char PC2_D[] =
+static u_char un_pbox[32];
+static u_char pbox[32] = {
+ 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
+ 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
+};
+
+static u_int32_t bits32[32] =
{
- 41, 52, 31, 37, 47, 55,
- 30, 40, 51, 45, 33, 48,
- 44, 49, 39, 56, 34, 53,
- 46, 42, 50, 36, 29, 32,
+ 0x80000000, 0x40000000, 0x20000000, 0x10000000,
+ 0x08000000, 0x04000000, 0x02000000, 0x01000000,
+ 0x00800000, 0x00400000, 0x00200000, 0x00100000,
+ 0x00080000, 0x00040000, 0x00020000, 0x00010000,
+ 0x00008000, 0x00004000, 0x00002000, 0x00001000,
+ 0x00000800, 0x00000400, 0x00000200, 0x00000100,
+ 0x00000080, 0x00000040, 0x00000020, 0x00000010,
+ 0x00000008, 0x00000004, 0x00000002, 0x00000001
};
-/* The C and D arrays used to calculate the key schedule. */
-static char C[28];
-static char D[28];
+static u_char bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
+
+static u_int32_t saltbits;
+static u_int32_t old_salt;
+static u_int32_t *bits28, *bits24;
+static u_char init_perm[64], final_perm[64];
+static u_int32_t en_keysl[16], en_keysr[16];
+static u_int32_t de_keysl[16], de_keysr[16];
+static int des_initialised = 0;
+static u_char m_sbox[4][4096];
+static u_int32_t psbox[4][256];
+static u_int32_t ip_maskl[8][256], ip_maskr[8][256];
+static u_int32_t fp_maskl[8][256], fp_maskr[8][256];
+static u_int32_t key_perm_maskl[8][128], key_perm_maskr[8][128];
+static u_int32_t comp_maskl[8][128], comp_maskr[8][128];
+static u_int32_t old_rawkey0, old_rawkey1;
-/* The key schedule. Generated from the key. */
-static char KS[16][48];
+static u_char ascii64[] =
+ "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+/* 0000000000111111111122222222223333333333444444444455555555556666 */
+/* 0123456789012345678901234567890123456789012345678901234567890123 */
-/* The E bit-selection table. */
-static char E[48];
-static const char e2[] =
+static INLINE int
+ascii_to_bin(char ch)
{
- 32, 1, 2, 3, 4, 5,
- 4, 5, 6, 7, 8, 9,
- 8, 9, 10, 11, 12, 13,
- 12, 13, 14, 15, 16, 17,
- 16, 17, 18, 19, 20, 21,
- 20, 21, 22, 23, 24, 25,
- 24, 25, 26, 27, 28, 29,
- 28, 29, 30, 31, 32, 1,
-};
+ if (ch > 'z')
+ return(0);
+ if (ch >= 'a')
+ return(ch - 'a' + 38);
+ if (ch > 'Z')
+ return(0);
+ if (ch >= 'A')
+ return(ch - 'A' + 12);
+ if (ch > '9')
+ return(0);
+ if (ch >= '.')
+ return(ch - '.');
+ return(0);
+}
-/**************************************************************************
-* Function: setkey
-*
-* Description: Set up the key schedule from the encryption key.
-*
-* Inputs: char *key
-* pointer to 64 character array. Each character represents a
-* bit in the key.
-*
-* Returns: none
-**************************************************************************/
-void setkey(char *key)
+static void
+des_init(void)
{
- int i, j, k, temp;
-
- /**********************************************************************
- * First, generate C and D by permuting the key. The low order bit of
- * each 8-bit char is not used, so C and D are only 28 bits apiece.
- **********************************************************************/
- for(i = 0; i < 28; i++)
- {
- C[i] = key[PC1_C[i] - 1];
- D[i] = key[PC1_D[i] - 1];
- }
-
- /**********************************************************************
- * To generate Ki, rotate C and D according to schedule and pick up a
- * permutation using PC2.
- **********************************************************************/
- for(i = 0; i < 16; i++)
- {
- /* rotate */
- for(k = 0; k < shifts[i]; k++)
- {
- temp = C[0];
-
- for(j = 0; j < 28 - 1; j++)
- C[j] = C[j+1];
-
- C[27] = temp;
- temp = D[0];
- for(j = 0; j < 28 - 1; j++)
- D[j] = D[j+1];
-
- D[27] = temp;
- }
-
- /* get Ki. Note C and D are concatenated */
- for(j = 0; j < 24; j++)
- {
- KS[i][j] = C[PC2_C[j] - 1];
- KS[i][j + 24] = D[PC2_D[j] - 28 -1];
- }
- }
-
- /* load E with the initial E bit selections */
- for(i=0; i < 48; i++)
- E[i] = e2[i];
+ int i, j, b, k, inbit, obit;
+ u_int32_t *p, *il, *ir, *fl, *fr;
+
+ old_rawkey0 = old_rawkey1 = 0L;
+ saltbits = 0L;
+ old_salt = 0L;
+ bits24 = (bits28 = bits32 + 4) + 4;
+
+ /*
+ * Invert the S-boxes, reordering the input bits.
+ */
+ for (i = 0; i < 8; i++)
+ for (j = 0; j < 64; j++) {
+ b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf);
+ u_sbox[i][j] = sbox[i][b];
+ }
+
+ /*
+ * Convert the inverted S-boxes into 4 arrays of 8 bits.
+ * Each will handle 12 bits of the S-box input.
+ */
+ for (b = 0; b < 4; b++)
+ for (i = 0; i < 64; i++)
+ for (j = 0; j < 64; j++)
+ m_sbox[b][(i << 6) | j] =
+ (u_char)((u_sbox[(b << 1)][i] << 4) |
+ u_sbox[(b << 1) + 1][j]);
+
+ /*
+ * Set up the initial & final permutations into a useful form, and
+ * initialise the inverted key permutation.
+ */
+ for (i = 0; i < 64; i++) {
+ init_perm[final_perm[i] = IP[i] - 1] = (u_char)i;
+ inv_key_perm[i] = 255;
+ }
+
+ /*
+ * Invert the key permutation and initialise the inverted key
+ * compression permutation.
+ */
+ for (i = 0; i < 56; i++) {
+ inv_key_perm[key_perm[i] - 1] = (u_char)i;
+ inv_comp_perm[i] = 255;
+ }
+
+ /*
+ * Invert the key compression permutation.
+ */
+ for (i = 0; i < 48; i++) {
+ inv_comp_perm[comp_perm[i] - 1] = (u_char)i;
+ }
+
+ /*
+ * Set up the OR-mask arrays for the initial and final permutations,
+ * and for the key initial and compression permutations.
+ */
+ for (k = 0; k < 8; k++) {
+ for (i = 0; i < 256; i++) {
+ *(il = &ip_maskl[k][i]) = 0L;
+ *(ir = &ip_maskr[k][i]) = 0L;
+ *(fl = &fp_maskl[k][i]) = 0L;
+ *(fr = &fp_maskr[k][i]) = 0L;
+ for (j = 0; j < 8; j++) {
+ inbit = 8 * k + j;
+ if (i & bits8[j]) {
+ if ((obit = init_perm[inbit]) < 32)
+ *il |= bits32[obit];
+ else
+ *ir |= bits32[obit-32];
+ if ((obit = final_perm[inbit]) < 32)
+ *fl |= bits32[obit];
+ else
+ *fr |= bits32[obit - 32];
+ }
+ }
+ }
+ for (i = 0; i < 128; i++) {
+ *(il = &key_perm_maskl[k][i]) = 0L;
+ *(ir = &key_perm_maskr[k][i]) = 0L;
+ for (j = 0; j < 7; j++) {
+ inbit = 8 * k + j;
+ if (i & bits8[j + 1]) {
+ if ((obit = inv_key_perm[inbit]) == 255)
+ continue;
+ if (obit < 28)
+ *il |= bits28[obit];
+ else
+ *ir |= bits28[obit - 28];
+ }
+ }
+ *(il = &comp_maskl[k][i]) = 0L;
+ *(ir = &comp_maskr[k][i]) = 0L;
+ for (j = 0; j < 7; j++) {
+ inbit = 7 * k + j;
+ if (i & bits8[j + 1]) {
+ if ((obit=inv_comp_perm[inbit]) == 255)
+ continue;
+ if (obit < 24)
+ *il |= bits24[obit];
+ else
+ *ir |= bits24[obit - 24];
+ }
+ }
+ }
+ }
+
+ /*
+ * Invert the P-box permutation, and convert into OR-masks for
+ * handling the output of the S-box arrays setup above.
+ */
+ for (i = 0; i < 32; i++)
+ un_pbox[pbox[i] - 1] = (u_char)i;
+
+ for (b = 0; b < 4; b++)
+ for (i = 0; i < 256; i++) {
+ *(p = &psbox[b][i]) = 0L;
+ for (j = 0; j < 8; j++) {
+ if (i & bits8[j])
+ *p |= bits32[un_pbox[8 * b + j]];
+ }
+ }
+
+ des_initialised = 1;
}
-/**************************************************************************
-* The 8 selection functions. For some reason, they give a 0-origin
-* index, unlike everything else.
-**************************************************************************/
+static void
+setup_salt(u_int32_t salt)
+{
+ u_int32_t obit, saltbit;
+ int i;
-static const char S[8][64] =
+ if (salt == old_salt)
+ return;
+ old_salt = salt;
+
+ saltbits = 0L;
+ saltbit = 1;
+ obit = 0x800000;
+ for (i = 0; i < 24; i++) {
+ if (salt & saltbit)
+ saltbits |= obit;
+ saltbit <<= 1;
+ obit >>= 1;
+ }
+}
+
+static int
+des_setkey(const char *key)
{
- {
- 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
- 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
- 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
- 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
- },
-
- {
- 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
- 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
- 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
- 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
- },
-
- {
- 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
- 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
- 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
- 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
- },
-
- {
- 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
- 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
- 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
- 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
- },
-
- {
- 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
- 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
- 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
- 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
- },
-
- {
- 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
- 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
- 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
- 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
- },
-
- {
- 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
- 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
- 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
- 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
- },
-
- {
- 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
- 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
- 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
- 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
- }
-};
+ u_int32_t k0, k1, rawkey0, rawkey1;
+ int shifts, round;
-/**************************************************************************
-* P is a permutation on the selected combination of the current L and key.
-**************************************************************************/
-static const char P[] =
+ if (!des_initialised)
+ des_init();
+
+ rawkey0 = ntohl(*(const u_int32_t *) key);
+ rawkey1 = ntohl(*(const u_int32_t *) (key + 4));
+
+ if ((rawkey0 | rawkey1)
+ && rawkey0 == old_rawkey0
+ && rawkey1 == old_rawkey1) {
+ /*
+ * Already setup for this key.
+ * This optimisation fails on a zero key (which is weak and
+ * has bad parity anyway) in order to simplify the starting
+ * conditions.
+ */
+ return(0);
+ }
+ old_rawkey0 = rawkey0;
+ old_rawkey1 = rawkey1;
+
+ /*
+ * Do key permutation and split into two 28-bit subkeys.
+ */
+ k0 = key_perm_maskl[0][rawkey0 >> 25]
+ | key_perm_maskl[1][(rawkey0 >> 17) & 0x7f]
+ | key_perm_maskl[2][(rawkey0 >> 9) & 0x7f]
+ | key_perm_maskl[3][(rawkey0 >> 1) & 0x7f]
+ | key_perm_maskl[4][rawkey1 >> 25]
+ | key_perm_maskl[5][(rawkey1 >> 17) & 0x7f]
+ | key_perm_maskl[6][(rawkey1 >> 9) & 0x7f]
+ | key_perm_maskl[7][(rawkey1 >> 1) & 0x7f];
+ k1 = key_perm_maskr[0][rawkey0 >> 25]
+ | key_perm_maskr[1][(rawkey0 >> 17) & 0x7f]
+ | key_perm_maskr[2][(rawkey0 >> 9) & 0x7f]
+ | key_perm_maskr[3][(rawkey0 >> 1) & 0x7f]
+ | key_perm_maskr[4][rawkey1 >> 25]
+ | key_perm_maskr[5][(rawkey1 >> 17) & 0x7f]
+ | key_perm_maskr[6][(rawkey1 >> 9) & 0x7f]
+ | key_perm_maskr[7][(rawkey1 >> 1) & 0x7f];
+ /*
+ * Rotate subkeys and do compression permutation.
+ */
+ shifts = 0;
+ for (round = 0; round < 16; round++) {
+ u_int32_t t0, t1;
+
+ shifts += key_shifts[round];
+
+ t0 = (k0 << shifts) | (k0 >> (28 - shifts));
+ t1 = (k1 << shifts) | (k1 >> (28 - shifts));
+
+ de_keysl[15 - round] =
+ en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f]
+ | comp_maskl[1][(t0 >> 14) & 0x7f]
+ | comp_maskl[2][(t0 >> 7) & 0x7f]
+ | comp_maskl[3][t0 & 0x7f]
+ | comp_maskl[4][(t1 >> 21) & 0x7f]
+ | comp_maskl[5][(t1 >> 14) & 0x7f]
+ | comp_maskl[6][(t1 >> 7) & 0x7f]
+ | comp_maskl[7][t1 & 0x7f];
+
+ de_keysr[15 - round] =
+ en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f]
+ | comp_maskr[1][(t0 >> 14) & 0x7f]
+ | comp_maskr[2][(t0 >> 7) & 0x7f]
+ | comp_maskr[3][t0 & 0x7f]
+ | comp_maskr[4][(t1 >> 21) & 0x7f]
+ | comp_maskr[5][(t1 >> 14) & 0x7f]
+ | comp_maskr[6][(t1 >> 7) & 0x7f]
+ | comp_maskr[7][t1 & 0x7f];
+ }
+ return(0);
+}
+
+static int
+do_des( u_int32_t l_in, u_int32_t r_in, u_int32_t *l_out, u_int32_t *r_out, int count)
{
- 16, 7, 20, 21,
- 29, 12, 28, 17,
- 1, 15, 23, 26,
- 5, 18, 31, 10,
- 2, 8, 24, 14,
- 32, 27, 3, 9,
- 19, 13, 30, 6,
- 22, 11, 4, 25,
-};
+ /*
+ * l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
+ */
+ u_int32_t l, r, *kl, *kr, *kl1, *kr1;
+ u_int32_t f, r48l, r48r;
+ int round;
-/* The combination of the key and the input, before selection. */
-static char preS[48];
+ if (count == 0) {
+ return(1);
+ } else if (count > 0) {
+ /*
+ * Encrypting
+ */
+ kl1 = en_keysl;
+ kr1 = en_keysr;
+ } else {
+ /*
+ * Decrypting
+ */
+ count = -count;
+ kl1 = de_keysl;
+ kr1 = de_keysr;
+ }
-/**************************************************************************
-* Function: encrypt
-*
-* Description: Uses DES to encrypt a 64 bit block of data. Requires
-* setkey to be invoked with the encryption key before it may
-* be used. The results of the encryption are stored in block.
-*
-* Inputs: char *block
-* pointer to 64 character array. Each character represents a
-* bit in the data block.
-*
-* Returns: none
-**************************************************************************/
-void encrypt(char *block)
+ /*
+ * Do initial permutation (IP).
+ */
+ l = ip_maskl[0][l_in >> 24]
+ | ip_maskl[1][(l_in >> 16) & 0xff]
+ | ip_maskl[2][(l_in >> 8) & 0xff]
+ | ip_maskl[3][l_in & 0xff]
+ | ip_maskl[4][r_in >> 24]
+ | ip_maskl[5][(r_in >> 16) & 0xff]
+ | ip_maskl[6][(r_in >> 8) & 0xff]
+ | ip_maskl[7][r_in & 0xff];
+ r = ip_maskr[0][l_in >> 24]
+ | ip_maskr[1][(l_in >> 16) & 0xff]
+ | ip_maskr[2][(l_in >> 8) & 0xff]
+ | ip_maskr[3][l_in & 0xff]
+ | ip_maskr[4][r_in >> 24]
+ | ip_maskr[5][(r_in >> 16) & 0xff]
+ | ip_maskr[6][(r_in >> 8) & 0xff]
+ | ip_maskr[7][r_in & 0xff];
+
+ while (count--) {
+ /*
+ * Do each round.
+ */
+ kl = kl1;
+ kr = kr1;
+ round = 16;
+ while (round--) {
+ /*
+ * Expand R to 48 bits (simulate the E-box).
+ */
+ r48l = ((r & 0x00000001) << 23)
+ | ((r & 0xf8000000) >> 9)
+ | ((r & 0x1f800000) >> 11)
+ | ((r & 0x01f80000) >> 13)
+ | ((r & 0x001f8000) >> 15);
+
+ r48r = ((r & 0x0001f800) << 7)
+ | ((r & 0x00001f80) << 5)
+ | ((r & 0x000001f8) << 3)
+ | ((r & 0x0000001f) << 1)
+ | ((r & 0x80000000) >> 31);
+ /*
+ * Do salting for crypt() and friends, and
+ * XOR with the permuted key.
+ */
+ f = (r48l ^ r48r) & saltbits;
+ r48l ^= f ^ *kl++;
+ r48r ^= f ^ *kr++;
+ /*
+ * Do sbox lookups (which shrink it back to 32 bits)
+ * and do the pbox permutation at the same time.
+ */
+ f = psbox[0][m_sbox[0][r48l >> 12]]
+ | psbox[1][m_sbox[1][r48l & 0xfff]]
+ | psbox[2][m_sbox[2][r48r >> 12]]
+ | psbox[3][m_sbox[3][r48r & 0xfff]];
+ /*
+ * Now that we've permuted things, complete f().
+ */
+ f ^= l;
+ l = r;
+ r = f;
+ }
+ r = l;
+ l = f;
+ }
+ /*
+ * Do final permutation (inverse of IP).
+ */
+ *l_out = fp_maskl[0][l >> 24]
+ | fp_maskl[1][(l >> 16) & 0xff]
+ | fp_maskl[2][(l >> 8) & 0xff]
+ | fp_maskl[3][l & 0xff]
+ | fp_maskl[4][r >> 24]
+ | fp_maskl[5][(r >> 16) & 0xff]
+ | fp_maskl[6][(r >> 8) & 0xff]
+ | fp_maskl[7][r & 0xff];
+ *r_out = fp_maskr[0][l >> 24]
+ | fp_maskr[1][(l >> 16) & 0xff]
+ | fp_maskr[2][(l >> 8) & 0xff]
+ | fp_maskr[3][l & 0xff]
+ | fp_maskr[4][r >> 24]
+ | fp_maskr[5][(r >> 16) & 0xff]
+ | fp_maskr[6][(r >> 8) & 0xff]
+ | fp_maskr[7][r & 0xff];
+ return(0);
+}
+
+static int
+des_cipher(const char *in, char *out, u_long salt, int count)
{
- int i, ii, temp, j, k;
-
- char left[32], right[32]; /* block in two halves */
- char old[32];
- char f[32];
-
- /* First, permute the bits in the input */
- for(j = 0; j < 32; j++)
- left[j] = block[IP[j] - 1];
-
- for(;j < 64; j++)
- right[j - 32] = block[IP[j] - 1];
-
- /* Perform an encryption operation 16 times. */
- for(ii= 0; ii < 16; ii++)
- {
- i = ii;
- /* Save the right array, which will be the new left. */
- for(j = 0; j < 32; j++)
- old[j] = right[j];
-
- /******************************************************************
- * Expand right to 48 bits using the E selector and
- * exclusive-or with the current key bits.
- ******************************************************************/
- for(j =0 ; j < 48; j++)
- preS[j] = right[E[j] - 1] ^ KS[i][j];
-
- /******************************************************************
- * The pre-select bits are now considered in 8 groups of 6 bits ea.
- * The 8 selection functions map these 6-bit quantities into 4-bit
- * quantities and the results are permuted to make an f(R, K).
- * The indexing into the selection functions is peculiar;
- * it could be simplified by rewriting the tables.
- ******************************************************************/
- for(j = 0; j < 8; j++)
- {
- temp = 6 * j;
- k = S[j][(preS[temp + 0] << 5) +
- (preS[temp + 1] << 3) +
- (preS[temp + 2] << 2) +
- (preS[temp + 3] << 1) +
- (preS[temp + 4] << 0) +
- (preS[temp + 5] << 4)];
-
- temp = 4 * j;
-
- f[temp + 0] = (k >> 3) & 01;
- f[temp + 1] = (k >> 2) & 01;
- f[temp + 2] = (k >> 1) & 01;
- f[temp + 3] = (k >> 0) & 01;
- }
-
- /******************************************************************
- * The new right is left ^ f(R, K).
- * The f here has to be permuted first, though.
- ******************************************************************/
- for(j = 0; j < 32; j++)
- right[j] = left[j] ^ f[P[j] - 1];
-
- /* Finally, the new left (the original right) is copied back. */
- for(j = 0; j < 32; j++)
- left[j] = old[j];
- }
-
- /* The output left and right are reversed. */
- for(j = 0; j < 32; j++)
- {
- temp = left[j];
- left[j] = right[j];
- right[j] = temp;
- }
-
- /* The final output gets the inverse permutation of the very original. */
- for(j = 0; j < 64; j++)
- {
- i = FP[j];
- if (i < 33)
- block[j] = left[FP[j] - 1];
- else
- block[j] = right[FP[j] - 33];
- }
+ u_int32_t l_out, r_out, rawl, rawr;
+ int retval;
+ union {
+ u_int32_t *ui32;
+ const char *c;
+ } trans;
+
+ if (!des_initialised)
+ des_init();
+
+ setup_salt(salt);
+
+ trans.c = in;
+ rawl = ntohl(*trans.ui32++);
+ rawr = ntohl(*trans.ui32);
+
+ retval = do_des(rawl, rawr, &l_out, &r_out, count);
+
+ trans.c = out;
+ *trans.ui32++ = htonl(l_out);
+ *trans.ui32 = htonl(r_out);
+ return(retval);
}
-/**************************************************************************
-* Function: crypt
-*
-* Description: Clone of Unix crypt(3) function.
-*
-* Inputs: char *pw
-* pointer to 8 character encryption key (user password)
-* char *salt
-* pointer to 2 character salt used to modify the DES results.
-*
-* Returns: Pointer to static array containing the salt concatenated
-* on to the encrypted results. Same as stored in passwd file.
-**************************************************************************/
-char *crypt(char *pw, char *salt)
+char *
+crypt_des(const char *key, const char *setting)
{
- int i, j, temp;
- char c,
- block[66]; /* 1st store key, then results */
- static char iobuf[16]; /* encrypted results */
-
- for(i = 0; i < 66; i++)
- block[i] = 0;
-
- /* break pw into 64 bits */
- for(i = 0, c = *pw; c && (i < 64); i++)
- {
- for(j = 0; j < 7; j++, i++)
- block[i] = (c >> (6 - j)) & 01;
- pw++;
- c = *pw;
- }
-
- /* set key based on pw */
- setkey(block);
-
- for(i = 0; i < 66; i++)
- block[i] = 0;
-
- for(i = 0; i < 2; i++)
- {
- /* store salt at beginning of results */
- c = *salt++;
- iobuf[i] = c;
-
- if(c > 'Z')
- c -= 6;
-
- if(c > '9')
- c -= 7;
-
- c -= '.';
-
- /* use salt to effect the E-bit selection */
- for(j = 0; j < 6; j++)
- {
- if((c >> j) & 01)
- {
- temp = E[6 * i + j];
- E[6 * i +j] = E[6 * i + j + 24];
- E[6 * i + j + 24] = temp;
- }
- }
- }
-
- /* call DES encryption 25 times using pw as key and initial data = 0 */
- for(i = 0; i < 25; i++)
- encrypt(block);
-
- /* format encrypted block for standard crypt(3) output */
- for(i=0; i < 11; i++)
- {
- c = 0;
- for(j = 0; j < 6; j++)
- {
- c <<= 1;
- c |= block[6 * i + j];
- }
-
- c += '.';
- if(c > '9')
- c += 7;
-
- if(c > 'Z')
- c += 6;
-
- iobuf[i + 2] = c;
- }
-
- iobuf[i + 2] = '\0';
-
- /* prevent premature NULL terminator */
- if(iobuf[1] == '\0')
- iobuf[1] = iobuf[0];
-
- return(iobuf);
+ int i;
+ u_int32_t count, salt, l, r0, r1, keybuf[2];
+ u_char *p, *q;
+ static char output[21];
+
+ if (!des_initialised)
+ des_init();
+
+ /*
+ * Copy the key, shifting each character up by one bit
+ * and padding with zeros.
+ */
+ q = (u_char *)keybuf;
+ while (q - (u_char *)keybuf - 8) {
+ *q++ = *key << 1;
+ if (*key != '\0')
+ key++;
+ }
+ if (des_setkey((char *)keybuf))
+ return(NULL);
+
+ if (*setting == _PASSWORD_EFMT1) {
+ /*
+ * "new"-style:
+ * setting - underscore, 4 bytes of count, 4 bytes of salt
+ * key - unlimited characters
+ */
+ for (i = 1, count = 0L; i < 5; i++)
+ count |= ascii_to_bin(setting[i]) << ((i - 1) * 6);
+
+ for (i = 5, salt = 0L; i < 9; i++)
+ salt |= ascii_to_bin(setting[i]) << ((i - 5) * 6);
+
+ while (*key) {
+ /*
+ * Encrypt the key with itself.
+ */
+ if (des_cipher((char *)keybuf, (char *)keybuf, 0L, 1))
+ return(NULL);
+ /*
+ * And XOR with the next 8 characters of the key.
+ */
+ q = (u_char *)keybuf;
+ while (q - (u_char *)keybuf - 8 && *key)
+ *q++ ^= *key++ << 1;
+
+ if (des_setkey((char *)keybuf))
+ return(NULL);
+ }
+ strncpy(output, setting, 9);
+
+ /*
+ * Double check that we weren't given a short setting.
+ * If we were, the above code will probably have created
+ * wierd values for count and salt, but we don't really care.
+ * Just make sure the output string doesn't have an extra
+ * NUL in it.
+ */
+ output[9] = '\0';
+ p = (u_char *)output + strlen(output);
+ } else {
+ /*
+ * "old"-style:
+ * setting - 2 bytes of salt
+ * key - up to 8 characters
+ */
+ count = 25;
+
+ salt = (ascii_to_bin(setting[1]) << 6)
+ | ascii_to_bin(setting[0]);
+
+ output[0] = setting[0];
+ /*
+ * If the encrypted password that the salt was extracted from
+ * is only 1 character long, the salt will be corrupted. We
+ * need to ensure that the output string doesn't have an extra
+ * NUL in it!
+ */
+ output[1] = setting[1] ? setting[1] : output[0];
+
+ p = (u_char *)output + 2;
+ }
+ setup_salt(salt);
+ /*
+ * Do it.
+ */
+ if (do_des(0L, 0L, &r0, &r1, (int)count))
+ return(NULL);
+ /*
+ * Now encode the result...
+ */
+ l = (r0 >> 8);
+ *p++ = ascii64[(l >> 18) & 0x3f];
+ *p++ = ascii64[(l >> 12) & 0x3f];
+ *p++ = ascii64[(l >> 6) & 0x3f];
+ *p++ = ascii64[l & 0x3f];
+
+ l = (r0 << 16) | ((r1 >> 16) & 0xffff);
+ *p++ = ascii64[(l >> 18) & 0x3f];
+ *p++ = ascii64[(l >> 12) & 0x3f];
+ *p++ = ascii64[(l >> 6) & 0x3f];
+ *p++ = ascii64[l & 0x3f];
+
+ l = r1 << 2;
+ *p++ = ascii64[(l >> 12) & 0x3f];
+ *p++ = ascii64[(l >> 6) & 0x3f];
+ *p++ = ascii64[l & 0x3f];
+ *p = 0;
+
+ return(output);
+}
+/* END: https://github.com/freebsd/freebsd/blob/master/secure/lib/libcrypt/crypt-des.c */
+
+
+/* START: https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/crypt-md5.c */
+char *
+crypt_md5(const char *pw, const char *salt)
+{
+ MD5_CTX ctx,ctx1;
+ unsigned long l;
+ int sl, pl;
+ u_int i;
+ u_char final[MD5_SIZE];
+ static const char *sp, *ep;
+ static char passwd[120], *p;
+ static const char *magic = "$1$";
+
+ /* Refine the Salt first */
+ sp = salt;
+
+ /* If it starts with the magic string, then skip that */
+ if(!strncmp(sp, magic, strlen(magic)))
+ sp += strlen(magic);
+
+ /* It stops at the first '$', max 8 chars */
+ for(ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
+ continue;
+
+ /* get the length of the true salt */
+ sl = ep - sp;
+
+ MD5Init(&ctx);
+
+ /* The password first, since that is what is most unknown */
+ MD5Update(&ctx, (const u_char *)pw, strlen(pw));
+
+ /* Then our magic string */
+ MD5Update(&ctx, (const u_char *)magic, strlen(magic));
+
+ /* Then the raw salt */
+ MD5Update(&ctx, (const u_char *)sp, (u_int)sl);
+
+ /* Then just as many characters of the MD5(pw,salt,pw) */
+ MD5Init(&ctx1);
+ MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
+ MD5Update(&ctx1, (const u_char *)sp, (u_int)sl);
+ MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
+ MD5Final(final, &ctx1);
+ for(pl = (int)strlen(pw); pl > 0; pl -= MD5_SIZE)
+ MD5Update(&ctx, (const u_char *)final,
+ (u_int)(pl > MD5_SIZE ? MD5_SIZE : pl));
+
+ /* Don't leave anything around in vm they could use. */
+ memset(final, 0, sizeof(final));
+
+ /* Then something really weird... */
+ for (i = strlen(pw); i; i >>= 1)
+ if(i & 1)
+ MD5Update(&ctx, (const u_char *)final, 1);
+ else
+ MD5Update(&ctx, (const u_char *)pw, 1);
+
+ /* Now make the output string */
+ strcpy(passwd, magic);
+ strncat(passwd, sp, (u_int)sl);
+ strcat(passwd, "$");
+
+ MD5Final(final, &ctx);
+
+ /*
+ * and now, just to make sure things don't run too fast
+ * On a 60 Mhz Pentium this takes 34 msec, so you would
+ * need 30 seconds to build a 1000 entry dictionary...
+ */
+ for(i = 0; i < 1000; i++) {
+ MD5Init(&ctx1);
+ if(i & 1)
+ MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
+ else
+ MD5Update(&ctx1, (const u_char *)final, MD5_SIZE);
+
+ if(i % 3)
+ MD5Update(&ctx1, (const u_char *)sp, (u_int)sl);
+
+ if(i % 7)
+ MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
+
+ if(i & 1)
+ MD5Update(&ctx1, (const u_char *)final, MD5_SIZE);
+ else
+ MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
+ MD5Final(final, &ctx1);
+ }
+
+ p = passwd + strlen(passwd);
+
+ l = (final[ 0]<<16) | (final[ 6]<<8) | final[12];
+ _crypt_to64(p, l, 4); p += 4;
+ l = (final[ 1]<<16) | (final[ 7]<<8) | final[13];
+ _crypt_to64(p, l, 4); p += 4;
+ l = (final[ 2]<<16) | (final[ 8]<<8) | final[14];
+ _crypt_to64(p, l, 4); p += 4;
+ l = (final[ 3]<<16) | (final[ 9]<<8) | final[15];
+ _crypt_to64(p, l, 4); p += 4;
+ l = (final[ 4]<<16) | (final[10]<<8) | final[ 5];
+ _crypt_to64(p, l, 4); p += 4;
+ l = final[11];
+ _crypt_to64(p, l, 2); p += 2;
+ *p = '\0';
+
+ /* Don't leave anything around in vm they could use. */
+ memset(final, 0, sizeof(final));
+
+ return (passwd);
+}
+/* END: https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/crypt-md5.c */
+
+
+/* START: https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/crypt-sha256.c */
+static const char sha256_salt_prefix[] = "$5$";
+
+/* Prefix for optional rounds specification. */
+static const char sha256_rounds_prefix[] = "rounds=";
+
+/* Maximum salt string length. */
+#define SALT_LEN_MAX 16
+/* Default number of rounds if not explicitly specified. */
+#define ROUNDS_DEFAULT 5000
+/* Minimum number of rounds. */
+#define ROUNDS_MIN 1000
+/* Maximum number of rounds. */
+#define ROUNDS_MAX 999999999
+
+static char *
+crypt_sha256_r(const char *key, const char *salt, char *buffer, int buflen)
+{
+ u_long srounds;
+ int n;
+ uint8_t alt_result[32], temp_result[32];
+ SHA256_CTX ctx, alt_ctx;
+ size_t salt_len, key_len, cnt, rounds;
+ char *cp, *copied_key, *copied_salt, *p_bytes, *s_bytes, *endp;
+ const char *num;
+ bool rounds_custom;
+
+ copied_key = NULL;
+ copied_salt = NULL;
+
+ /* Default number of rounds. */
+ rounds = ROUNDS_DEFAULT;
+ rounds_custom = false;
+
+ /* Find beginning of salt string. The prefix should normally always
+ * be present. Just in case it is not. */
+ if (strncmp(sha256_salt_prefix, salt, sizeof(sha256_salt_prefix) - 1) == 0)
+ /* Skip salt prefix. */
+ salt += sizeof(sha256_salt_prefix) - 1;
+
+ if (strncmp(salt, sha256_rounds_prefix, sizeof(sha256_rounds_prefix) - 1)
+ == 0) {
+ num = salt + sizeof(sha256_rounds_prefix) - 1;
+ srounds = strtoul(num, &endp, 10);
+
+ if (*endp == '$') {
+ salt = endp + 1;
+ rounds = MAX(ROUNDS_MIN, MIN(srounds, ROUNDS_MAX));
+ rounds_custom = true;
+ }
+ }
+
+ salt_len = MIN(strcspn(salt, "$"), SALT_LEN_MAX);
+ key_len = strlen(key);
+
+ /* Prepare for the real work. */
+ SHA256_Init(&ctx);
+
+ /* Add the key string. */
+ SHA256_Update(&ctx, key, key_len);
+
+ /* The last part is the salt string. This must be at most 8
+ * characters and it ends at the first `$' character (for
+ * compatibility with existing implementations). */
+ SHA256_Update(&ctx, salt, salt_len);
+
+ /* Compute alternate SHA256 sum with input KEY, SALT, and KEY. The
+ * final result will be added to the first context. */
+ SHA256_Init(&alt_ctx);
+
+ /* Add key. */
+ SHA256_Update(&alt_ctx, key, key_len);
+
+ /* Add salt. */
+ SHA256_Update(&alt_ctx, salt, salt_len);
+
+ /* Add key again. */
+ SHA256_Update(&alt_ctx, key, key_len);
+
+ /* Now get result of this (32 bytes) and add it to the other context. */
+ SHA256_Final(alt_result, &alt_ctx);
+
+ /* Add for any character in the key one byte of the alternate sum. */
+ for (cnt = key_len; cnt > 32; cnt -= 32)
+ SHA256_Update(&ctx, alt_result, 32);
+ SHA256_Update(&ctx, alt_result, cnt);
+
+ /* Take the binary representation of the length of the key and for
+ * every 1 add the alternate sum, for every 0 the key. */
+ for (cnt = key_len; cnt > 0; cnt >>= 1)
+ if ((cnt & 1) != 0)
+ SHA256_Update(&ctx, alt_result, 32);
+ else
+ SHA256_Update(&ctx, key, key_len);
+
+ /* Create intermediate result. */
+ SHA256_Final(alt_result, &ctx);
+
+ /* Start computation of P byte sequence. */
+ SHA256_Init(&alt_ctx);
+
+ /* For every character in the password add the entire password. */
+ for (cnt = 0; cnt < key_len; ++cnt)
+ SHA256_Update(&alt_ctx, key, key_len);
+
+ /* Finish the digest. */
+ SHA256_Final(temp_result, &alt_ctx);
+
+ /* Create byte sequence P. */
+ cp = p_bytes = alloca(key_len);
+ for (cnt = key_len; cnt >= 32; cnt -= 32) {
+ memcpy(cp, temp_result, 32);
+ cp += 32;
+ }
+ memcpy(cp, temp_result, cnt);
+
+ /* Start computation of S byte sequence. */
+ SHA256_Init(&alt_ctx);
+
+ /* For every character in the password add the entire password. */
+ for (cnt = 0; cnt < 16 + alt_result[0]; ++cnt)
+ SHA256_Update(&alt_ctx, salt, salt_len);
+
+ /* Finish the digest. */
+ SHA256_Final(temp_result, &alt_ctx);
+
+ /* Create byte sequence S. */
+ cp = s_bytes = alloca(salt_len);
+ for (cnt = salt_len; cnt >= 32; cnt -= 32) {
+ memcpy(cp, temp_result, 32);
+ cp += 32;
+ }
+ memcpy(cp, temp_result, cnt);
+
+ /* Repeatedly run the collected hash value through SHA256 to burn CPU
+ * cycles. */
+ for (cnt = 0; cnt < rounds; ++cnt) {
+ /* New context. */
+ SHA256_Init(&ctx);
+
+ /* Add key or last result. */
+ if ((cnt & 1) != 0)
+ SHA256_Update(&ctx, p_bytes, key_len);
+ else
+ SHA256_Update(&ctx, alt_result, 32);
+
+ /* Add salt for numbers not divisible by 3. */
+ if (cnt % 3 != 0)
+ SHA256_Update(&ctx, s_bytes, salt_len);
+
+ /* Add key for numbers not divisible by 7. */
+ if (cnt % 7 != 0)
+ SHA256_Update(&ctx, p_bytes, key_len);
+
+ /* Add key or last result. */
+ if ((cnt & 1) != 0)
+ SHA256_Update(&ctx, alt_result, 32);
+ else
+ SHA256_Update(&ctx, p_bytes, key_len);
+
+ /* Create intermediate result. */
+ SHA256_Final(alt_result, &ctx);
+ }
+
+ /* Now we can construct the result string. It consists of three
+ * parts. */
+ cp = stpncpy(buffer, sha256_salt_prefix, MAX(0, buflen));
+ buflen -= sizeof(sha256_salt_prefix) - 1;
+
+ if (rounds_custom) {
+ n = snprintf(cp, MAX(0, buflen), "%s%zu$",
+ sha256_rounds_prefix, rounds);
+
+ cp += n;
+ buflen -= n;
+ }
+
+ cp = stpncpy(cp, salt, MIN((size_t)MAX(0, buflen), salt_len));
+ buflen -= MIN((size_t)MAX(0, buflen), salt_len);
+
+ if (buflen > 0) {
+ *cp++ = '$';
+ --buflen;
+ }
+
+ b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[15], alt_result[25], alt_result[5], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[6], alt_result[16], alt_result[26], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[27], alt_result[7], alt_result[17], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[18], alt_result[28], alt_result[8], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[9], alt_result[19], alt_result[29], 4, &buflen, &cp);
+ b64_from_24bit(0, alt_result[31], alt_result[30], 3, &buflen, &cp);
+ if (buflen <= 0) {
+ errno = ERANGE;
+ buffer = NULL;
+ }
+ else
+ *cp = '\0'; /* Terminate the string. */
+
+ /* Clear the buffer for the intermediate result so that people
+ * attaching to processes or reading core dumps cannot get any
+ * information. We do it in this way to clear correct_words[] inside
+ * the SHA256 implementation as well. */
+ SHA256_Init(&ctx);
+ SHA256_Final(alt_result, &ctx);
+ memset(temp_result, '\0', sizeof(temp_result));
+ memset(p_bytes, '\0', key_len);
+ memset(s_bytes, '\0', salt_len);
+ memset(&ctx, '\0', sizeof(ctx));
+ memset(&alt_ctx, '\0', sizeof(alt_ctx));
+ if (copied_key != NULL)
+ memset(copied_key, '\0', key_len);
+ if (copied_salt != NULL)
+ memset(copied_salt, '\0', salt_len);
+
+ return buffer;
+}
+
+/* This entry point is equivalent to crypt(3). */
+char* crypt_sha256(const char *key, const char *salt)
+{
+ /* We don't want to have an arbitrary limit in the size of the
+ * password. We can compute an upper bound for the size of the
+ * result in advance and so we can prepare the buffer we pass to
+ * `crypt_sha256_r'. */
+ static char *buffer;
+ static int buflen;
+ int needed;
+ char *new_buffer;
+
+ needed = (sizeof(sha256_salt_prefix) - 1
+ + sizeof(sha256_rounds_prefix) + 9 + 1
+ + strlen(salt) + 1 + 43 + 1);
+
+ if (buflen < needed) {
+ new_buffer = (char *)realloc(buffer, needed);
+
+ if (new_buffer == NULL)
+ return NULL;
+
+ buffer = new_buffer;
+ buflen = needed;
+ }
+
+ return crypt_sha256_r(key, salt, buffer, buflen);
+}
+/* END: https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/crypt-sha256.c */
+
+
+/* START: https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/crypt-sha512.c */
+/* Define our magic string to mark salt for SHA512 "encryption" replacement. */
+static const char sha512_salt_prefix[] = "$6$";
+
+/* Prefix for optional rounds specification. */
+static const char sha512_rounds_prefix[] = "rounds=";
+
+/* Maximum salt string length. */
+#define SALT_LEN_MAX 16
+/* Default number of rounds if not explicitly specified. */
+#define ROUNDS_DEFAULT 5000
+/* Minimum number of rounds. */
+#define ROUNDS_MIN 1000
+/* Maximum number of rounds. */
+#define ROUNDS_MAX 999999999
+
+static char *
+crypt_sha512_r(const char *key, const char *salt, char *buffer, int buflen)
+{
+ u_long srounds;
+ int n;
+ uint8_t alt_result[64], temp_result[64];
+ SHA512_CTX ctx, alt_ctx;
+ size_t salt_len, key_len, cnt, rounds;
+ char *cp, *copied_key, *copied_salt, *p_bytes, *s_bytes, *endp;
+ const char *num;
+ bool rounds_custom;
+
+ copied_key = NULL;
+ copied_salt = NULL;
+
+ /* Default number of rounds. */
+ rounds = ROUNDS_DEFAULT;
+ rounds_custom = false;
+
+ /* Find beginning of salt string. The prefix should normally always
+ * be present. Just in case it is not. */
+ if (strncmp(sha512_salt_prefix, salt, sizeof(sha512_salt_prefix) - 1) == 0)
+ /* Skip salt prefix. */
+ salt += sizeof(sha512_salt_prefix) - 1;
+
+ if (strncmp(salt, sha512_rounds_prefix, sizeof(sha512_rounds_prefix) - 1)
+ == 0) {
+ num = salt + sizeof(sha512_rounds_prefix) - 1;
+ srounds = strtoul(num, &endp, 10);
+
+ if (*endp == '$') {
+ salt = endp + 1;
+ rounds = MAX(ROUNDS_MIN, MIN(srounds, ROUNDS_MAX));
+ rounds_custom = true;
+ }
+ }
+
+ salt_len = MIN(strcspn(salt, "$"), SALT_LEN_MAX);
+ key_len = strlen(key);
+
+ /* Prepare for the real work. */
+ SHA512_Init(&ctx);
+
+ /* Add the key string. */
+ SHA512_Update(&ctx, key, key_len);
+
+ /* The last part is the salt string. This must be at most 8
+ * characters and it ends at the first `$' character (for
+ * compatibility with existing implementations). */
+ SHA512_Update(&ctx, salt, salt_len);
+
+ /* Compute alternate SHA512 sum with input KEY, SALT, and KEY. The
+ * final result will be added to the first context. */
+ SHA512_Init(&alt_ctx);
+
+ /* Add key. */
+ SHA512_Update(&alt_ctx, key, key_len);
+
+ /* Add salt. */
+ SHA512_Update(&alt_ctx, salt, salt_len);
+
+ /* Add key again. */
+ SHA512_Update(&alt_ctx, key, key_len);
+
+ /* Now get result of this (64 bytes) and add it to the other context. */
+ SHA512_Final(alt_result, &alt_ctx);
+
+ /* Add for any character in the key one byte of the alternate sum. */
+ for (cnt = key_len; cnt > 64; cnt -= 64)
+ SHA512_Update(&ctx, alt_result, 64);
+ SHA512_Update(&ctx, alt_result, cnt);
+
+ /* Take the binary representation of the length of the key and for
+ * every 1 add the alternate sum, for every 0 the key. */
+ for (cnt = key_len; cnt > 0; cnt >>= 1)
+ if ((cnt & 1) != 0)
+ SHA512_Update(&ctx, alt_result, 64);
+ else
+ SHA512_Update(&ctx, key, key_len);
+
+ /* Create intermediate result. */
+ SHA512_Final(alt_result, &ctx);
+
+ /* Start computation of P byte sequence. */
+ SHA512_Init(&alt_ctx);
+
+ /* For every character in the password add the entire password. */
+ for (cnt = 0; cnt < key_len; ++cnt)
+ SHA512_Update(&alt_ctx, key, key_len);
+
+ /* Finish the digest. */
+ SHA512_Final(temp_result, &alt_ctx);
+
+ /* Create byte sequence P. */
+ cp = p_bytes = alloca(key_len);
+ for (cnt = key_len; cnt >= 64; cnt -= 64) {
+ memcpy(cp, temp_result, 64);
+ cp += 64;
+ }
+ memcpy(cp, temp_result, cnt);
+
+ /* Start computation of S byte sequence. */
+ SHA512_Init(&alt_ctx);
+
+ /* For every character in the password add the entire password. */
+ for (cnt = 0; cnt < 16 + alt_result[0]; ++cnt)
+ SHA512_Update(&alt_ctx, salt, salt_len);
+
+ /* Finish the digest. */
+ SHA512_Final(temp_result, &alt_ctx);
+
+ /* Create byte sequence S. */
+ cp = s_bytes = alloca(salt_len);
+ for (cnt = salt_len; cnt >= 64; cnt -= 64) {
+ memcpy(cp, temp_result, 64);
+ cp += 64;
+ }
+ memcpy(cp, temp_result, cnt);
+
+ /* Repeatedly run the collected hash value through SHA512 to burn CPU
+ * cycles. */
+ for (cnt = 0; cnt < rounds; ++cnt) {
+ /* New context. */
+ SHA512_Init(&ctx);
+
+ /* Add key or last result. */
+ if ((cnt & 1) != 0)
+ SHA512_Update(&ctx, p_bytes, key_len);
+ else
+ SHA512_Update(&ctx, alt_result, 64);
+
+ /* Add salt for numbers not divisible by 3. */
+ if (cnt % 3 != 0)
+ SHA512_Update(&ctx, s_bytes, salt_len);
+
+ /* Add key for numbers not divisible by 7. */
+ if (cnt % 7 != 0)
+ SHA512_Update(&ctx, p_bytes, key_len);
+
+ /* Add key or last result. */
+ if ((cnt & 1) != 0)
+ SHA512_Update(&ctx, alt_result, 64);
+ else
+ SHA512_Update(&ctx, p_bytes, key_len);
+
+ /* Create intermediate result. */
+ SHA512_Final(alt_result, &ctx);
+ }
+
+ /* Now we can construct the result string. It consists of three
+ * parts. */
+ cp = stpncpy(buffer, sha512_salt_prefix, MAX(0, buflen));
+ buflen -= sizeof(sha512_salt_prefix) - 1;
+
+ if (rounds_custom) {
+ n = snprintf(cp, MAX(0, buflen), "%s%zu$",
+ sha512_rounds_prefix, rounds);
+
+ cp += n;
+ buflen -= n;
+ }
+
+ cp = stpncpy(cp, salt, MIN((size_t)MAX(0, buflen), salt_len));
+ buflen -= MIN((size_t)MAX(0, buflen), salt_len);
+
+ if (buflen > 0) {
+ *cp++ = '$';
+ --buflen;
+ }
+
+ b64_from_24bit(alt_result[0], alt_result[21], alt_result[42], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[22], alt_result[43], alt_result[1], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[44], alt_result[2], alt_result[23], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[3], alt_result[24], alt_result[45], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[25], alt_result[46], alt_result[4], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[47], alt_result[5], alt_result[26], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[6], alt_result[27], alt_result[48], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[28], alt_result[49], alt_result[7], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[50], alt_result[8], alt_result[29], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[9], alt_result[30], alt_result[51], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[31], alt_result[52], alt_result[10], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[53], alt_result[11], alt_result[32], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[12], alt_result[33], alt_result[54], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[34], alt_result[55], alt_result[13], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[56], alt_result[14], alt_result[35], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[15], alt_result[36], alt_result[57], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[37], alt_result[58], alt_result[16], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[59], alt_result[17], alt_result[38], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[18], alt_result[39], alt_result[60], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[40], alt_result[61], alt_result[19], 4, &buflen, &cp);
+ b64_from_24bit(alt_result[62], alt_result[20], alt_result[41], 4, &buflen, &cp);
+ b64_from_24bit(0, 0, alt_result[63], 2, &buflen, &cp);
+
+ if (buflen <= 0) {
+ errno = ERANGE;
+ buffer = NULL;
+ }
+ else
+ *cp = '\0'; /* Terminate the string. */
+
+ /* Clear the buffer for the intermediate result so that people
+ * attaching to processes or reading core dumps cannot get any
+ * information. We do it in this way to clear correct_words[] inside
+ * the SHA512 implementation as well. */
+ SHA512_Init(&ctx);
+ SHA512_Final(alt_result, &ctx);
+ memset(temp_result, '\0', sizeof(temp_result));
+ memset(p_bytes, '\0', key_len);
+ memset(s_bytes, '\0', salt_len);
+ memset(&ctx, '\0', sizeof(ctx));
+ memset(&alt_ctx, '\0', sizeof(alt_ctx));
+ if (copied_key != NULL)
+ memset(copied_key, '\0', key_len);
+ if (copied_salt != NULL)
+ memset(copied_salt, '\0', salt_len);
+
+ return buffer;
+}
+
+/* This entry point is equivalent to crypt(3). */
+char *
+crypt_sha512(const char *key, const char *salt)
+{
+ /* We don't want to have an arbitrary limit in the size of the
+ * password. We can compute an upper bound for the size of the
+ * result in advance and so we can prepare the buffer we pass to
+ * `crypt_sha512_r'. */
+ static char *buffer;
+ static int buflen;
+ int needed;
+ char *new_buffer;
+
+ needed = (sizeof(sha512_salt_prefix) - 1
+ + sizeof(sha512_rounds_prefix) + 9 + 1
+ + strlen(salt) + 1 + 86 + 1);
+
+ if (buflen < needed) {
+ new_buffer = (char *)realloc(buffer, needed);
+
+ if (new_buffer == NULL)
+ return NULL;
+
+ buffer = new_buffer;
+ buflen = needed;
+ }
+
+ return crypt_sha512_r(key, salt, buffer, buflen);
+}
+/* END: https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/crypt-sha512.c */
+
+
+/** From https://github.com/freebsd/freebsd/blob/master/lib/libcrypt/crypt.c */
+static const struct crypt_format {
+ const char* const name;
+ const char* const magic;
+ char* (*const func)(char const*, char const*);
+} crypt_formats[] = {
+ { "des", "_", crypt_des },
+ { "md5", "$1$", crypt_md5 },
+ { "sha256", "$5$", crypt_sha256 },
+ { "sha512", "$6$", crypt_sha512 },
+ { NULL, NULL, NULL }
+};
+
+
+char* crypt(const char* key, const char* salt)
+{
+ int len;
+ const struct crypt_format *cf;
+
+ for (cf = crypt_formats; cf->name != NULL; ++cf) {
+ if (cf->magic != NULL && strstr(salt, cf->magic) == salt) {
+ return cf->func(key, salt);
+ }
+ }
+
+ len = strlen(salt);
+ if ((len == 13 || len == 2) && strspn(salt, DES_SALT_ALPHABET) == len) {
+ return (crypt_des(key, salt));
+ }
+
+ return crypt_formats[0].func(key, salt);
}
~mdw / termux-packages / commitdiff